Operational security is a big word for a simple concept; outsmart your adversary by cleaning up clues. Asking your teen to not post photos and videos of themselves or to use their real names may fall flat, but there is still lots to be done to help.
While few scammers will spend time getting to know their victims in order to hack them, personal animosity is too often the fuel someone needs to spend the time attempting to break into a victim’s account.
Be sure that your teens’ passwords and password recovery questions are unique and would not be guessable by anyone. Together, with multifactor authentication also in play, accounts will be that much harder to hack even for those willing to play a long game.